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File factory constructor
File(Creates a File object.
If path is a relative path, it will be interpreted relative to the current working directory (see Directory.current), when used.
If path is an absolute path, it will be immune to changes to the current working directory.
Source
factory File(String path) => new _File(path);
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https://api.dartlang.org/stable/1.24.3/dart-io/File/File.html